Right, I meant that each interaction that results in a payment going through actually consists of two transactions. I'll try to figure out a better way to word that.

phelix, I'm pretty sure that jevon's idea works as-is. I wrote a sample implementation in Node: https://github.com/hi-entropy/bitcoin-nanopayment

Thanks Mike! Jevon and Casascius pretty much came up with the protocol, I just implemented it. I'll take credit for that though!

Hi Jeff, thanks for taking a look!  I will definitely switch to use those libraries; they look much better than the current solution that I have shitpatched together.

I'm working on a probabilistic nanopayments library in Node: https://github.com/hi-entropy/bitcoin-nanopayment

It's an implementation of jevon's idea from this thread: https://bitcointalk.org/index.php?topic=62558.0

It's still very much alpha-stage, but it should be usable if anyone wants to start developing applications that make use of nanopayments.  I would love any feedback on documentation clarity, bugs, feature requests, or anything else about it!  So, yeah... have at it! 

Okay, I guess I better read up on open source licenses.  Not the most interesting thing for me, but it's important.  Thanks for the advice!

Hi guys!

As my first foray into open source software, I've come up with a working Node.js implementation of https://en.bitcoin.it/wiki/Nanopayments.  Before I release it, I need to decide on a license.  I'm thinking of going with GPL v3, because I recently saw Richard Stallman talk and I liked his ideas and beard.

Wondering
- Are there any implementations of nanopayments that already exist?
- Does the fact that I didn't come up with the nanopayment protocol restrict what licenses I can use?
- If I start with GPL v3, I can always relax the license to be more lenient, right?
- Any other implications of choosing a license that I should consider?

Advice much appreciated!!!